Improvement in combination locks



(93.) 3 sheets-shee I,

FRANKLIN P. MARSDEN... Improvement in Combination Locks. No. 122,124 Patented Dec. 26,1871.

FRANKLIN" P. MARSDEN 3 Sheets--Shoet 2'.

Improvement in Combination Locks.

' Patented Dec.26.187l.

' izdr'za/aw.

- jaw/M (93.) 2 s Shets sheet s.

FRANKLIN P. MA'RSDEN.

Improvement in Combinati on Locks.

No. 122,124, Patented Dec.126,1871.

uni-K UNITED STATES PATENT OFFICE.

FRANKLIN PETER MABSDEN, OF GALENA, ILLINOIS.

IMPROVEMENT IN CQMBINATION LOCKS.

Specification forming part of Letters Patent No. 122,124, dated December 26, 1871.

To all whom it mag concern:

Be it known that I, FRANKLIN PETER MARS- DEN, of Galena, in the county of J o Daviess and State of Illinois, have invented a new and Improved Lock; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings making part of this specification, in Which- Figure 1, Plate 1, is a view of the face of the lock. Fig.2, Plate 1, is a view of the interior of the look as seen by removing the back plate. Fig. 3, Plate 2, shows the wheel-work and'the bolts unlocked. Fig. 4 is a similar view of the same parts shown in Fig. 3, indicating the bolts locked. Fig. 5, Plate 3, is a view of the back of one of the flanged spur-wheels. Fig. 6, Plate 3, is a section taken transversely through the lock.

Similar letters of reference indicate correspond: ing parts in the several figures.

This invention relates to improvements on locks of the permutation kind, which are designed for bank-safes, jail-doors, and other purposes.

In carrying out this invention I employ a groovebolt frame, flanged spur-wheels, which are provided with adjustable stops; also, fixed stops on part of the lock-frame, against which the adjustable stops on the wheels abut in certain positions of these wheels on key-posts for moving the flanged spur-wheels; also, a contrivance whereby the spur-wheels are locked by turning backward the knob which moves the bolt-frame, all of which will be hereinafter more particularly described.

To enable others skilled in the art to understand my invention, I will describe its construction and operation.

In the accompanying drawings, A represents the lock-case, which has a removable back plate and a number of elevations formed on its front plate, which are centrally perforated to allow the introduction of a key, K. There is also projecting from the face plate of the case A a knob, a, for moving the bolt-frame B back and forward. On the inside of the'lock-case, and screwed fast to lugs cast therein,are two bars, G O, to which are permanently secured three bars, F F F, which affordback bearings for the shaft g g of spur-wheels G and S. The front bearings for the shafts of these wheels are in the face plate of the lock-case. The larger wheels G are rotated back and forth by means of the key K applied on. the square end b of posts g. The wheels G have semicircular flanges or ribs 19 on their. outer sides, which are concentric to the axes of their respective wheels, and which are designed to enter corresponding grooves t formed in the back side of the boltframe B when the bolts B are shot out, thus securely lo ckin g the bolt-frame in said position. To unlock the bolt-frame the several wheels G must be turned until their flanges or ribs 1) are out of the grooves t and free from the bolt-frame. B. Each one of the flanged spur-wheels hasa number of holes in its back side which are arranged concentrically to its axis, which holes are properly numbered and adapted for receiving a screw threaded stop, 1", shown in Figs. 3 and 4, Plate 2. On the front sides of two movable bars, D D are stop-pins t, which, when these bars are caused to approach each other, will engage with the teeth of all the spur-wheels G and prevent them from being turned either to the right or left hand. On the front side of the permanent bars F F are stoppins f, which are arranged so that the pins 1* on the wheels G will strike them when these wheels are' turned around to certain predetermined points. The bars D D are connected to the bars 00 by screws passed through slots 0, and these bars aremoved by means of joints 0, which are pivoted to the extremities of an oscillating lever, D Whose fulcrum is at f. The lever D has a curved slot, (1, through it, which terminates at one end in a short straight slot, d, and in this slot plays a pin, 11,.which is on the free end of a lever, J, attached to the stem of the knob a. When the pin '5 on lever J enters the straight portion 01 of slot d, the bars D D can be made to recede from each other and release the wheels G; and when the pin tleaves the straight slot 01 and enters the curved slot 01 the bars D D will approach each other, and the wheels G will be locked by the pins 0. The lever J is connected by a pin and slot (not shown) to the'boltframe, so that this frame can be moved endwise I by turning the knob a. It will be seen that when the wheels G are all turned so that their flanges are freed from the bolt-frame this bolt-frame may be moved by knob a, so as to lock or unlock the bolts. When the bolts are shot and the knob on is turned a little further, the pin 7; on lever J will cause the bars D D to recede from the wheels G, and thus release these wheels from their lock said bolt from the flanges 10, he cannot unlock ing-studs V. The wheels G may then be turned freely either to the right or left hand by means of the key K applied to the posts 9. When the knob is turned in the opposite direction to retract the bolts, the pin 6 on lever J will operate on the bars D D through the medium of lever D and joints 0, and cause said bars to approach each other and engage their studs '0 with the teeth of wheels Gr, thus locking these wheels and preventing them from being turned by the key K. The bolts can now be moved back and forth at pleasure by turning the knob a. When the bolts are shot they are locked by simply turning the wheels G and engaging the flanges 10 with their grooves t in the bolt-frame. Then, unless a person knows exactly how to turn the said wheels to release the the bolts. The holes in the backs of the wheels G are all numbered in regular order, commencing from any one of them, and the combinations are made by changing the pins whom one hole to another, carefully noting the number of the hole into which each pin 1 is inserted. Then, when the wheels are turned until their pins strike the fixed pins f on the bars F F, starting points are obtained from whichto commence turning the wheels G. The wheels are then turned certain distances in the proper directions to release the bolt-frame. There are marks on the hub of the key, and also on the peripheries of the circularlyraised positions around the key-holes, which will aid in calculating the number of times to turn the key in each hole.

In the drawings I have represented six lockingwheels, G; but it is obvious that a greater or less number of these wheels in ay be employed, according to the number of combinations required and the object for which the lock is designed.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, 1s- 7 1. The segmentgroove t in the side of the boltframe, as shown, in combination with the segmentflange or rib p on the toothed wheel G, as shown, and pinion S in a permutation look, all substantially as described.

2. In combination with the subject-matter embraced in the first claim, the perforations sin the back sides of the segmental flanged wheels G,

adjustable stop-pins o", and fixed stop-pinsf, all

substantially as shown and described.

3. The movable bars D D with locking-pins v, in combination with wheels G, joints 0, slotted lever D and the pin i on the end of knob-lever J, substantially as described. FRANKLIN PETER MARSDEN.

Witnesses:

JOHN WESTWIGK, F. Srnxxnm (93) 

